An "arpeggiated chord" means a chord which is "spread". This means the notes do not start exactly at the same time. This is sometimes called arpeggiato, and in modern music is called a rolled chord. An arpeggiated chord is written with a wiggly line going from top to bottom in front of the chord. An arpeggiated chord is spread from the lowest to the highest note. Occasionally composers such as Béla Bartók ask for them to be played from top to bottom. This is shown by adding an arrow pointing down.